树木气孔浸润级与SO_2伤害及ABA的防护作用

Tree stomatal infiltration and SO_2 injury and protection effect of ABA.

以常见绿化树种为材料 ,通过实地测定和熏烟实验 ,探讨了气孔浸润级与树木SO2 伤害的关系及ABA的防护效应 .结果表明 ,在特定环境下 ,相同树种的气孔浸润级较为稳定 ,不同树种的气孔浸润级差异较大 ;浸润级与叶绿素结合度呈负相关变化 ,但不明显 ;与K+渗出量呈正相关 (r =0 .92 ,α <0 .0 1) ,并按 95 %的置信度绘制了伤害预测图 .不同SO2 浓度条件下 ,对同一树种的气孔浸润级的影响甚小 ,不超过一个等级 ,K+渗出量则依大气SO2 浓度和树木吸S量的增加而增多 .气孔浸润级依ABA溶液处理浓度增大而降低 ,K+渗出量也相应减少 ,经 2 .5mol·L-1× 4h剂量的SO2 熏烟 ,预涂 30mol·L-1ABA者 ,降低了 1.5～ 3个浸润级 ,K+渗出量减少 36 .5 %～ 5 4.8% ,其测定值与自然对照值相近 ,防护作用显著 .

This paper deals with relation between tree stomatal infiltration and SO 2 injury and the protection effect of ABA. Experiments of SO 2 smoking to the selected trees were carried out and the data were collected in the field. The results show that stomatal infiltration was a comparably constant index for certain tree species. The infiltration of trees is negatively correlated with the combine extent of chlorophy, but not obviously. The index is also positively correlated with K + efflux in leaf(r=0.92, α<0.01). In the experiment of SO 2 smoking, the effect on infiltration of same species under different SO 2 concentration was little, less than one grade, while K + efflux increased with the increment of SO 2 amount absorbed by the leaves. When the leaves were sprayed with ABA solution, the higher the ABA solution concentration was, the lower the K + efflux was. When leaves sprayed with ABA solution were smoked with 2.5 mol·L -1 for four hours, the infiltration of leaves with 30 mol·L -1 ABA solution dropped 1.5～3 and K + concentration decreased 36.5%～54.8% on leaves. It indicates that the ABA solution on leaves has remarkable effect of protection of SO 2 injury.